Video telephony apparatus and method for mobile terminal

ABSTRACT

Provided is a video telephony apparatus and method for mobile terminals. The video telephony apparatus includes a controller, a display unit, a codec, and a content controller. The controller exchanges protocol signals for a video call with the other party terminal, and demultiplexes a moving image and a voice that are received from the other party terminal. The display unit displays the received moving image, and the codec plays the received voice. The content controller manages Right Objects (ROs) of multimedia contents received from the other party terminal, and captures the displayed moving image and the played voice according to the ROs. Accordingly, it is possible to protect portrait rights during the video call.

PRIORITY

This application claims priority under 35 U.S.C. §119 to an applicationentitled “Video Telephony Apparatus and Method for Mobile Terminal”filed in the Korean Intellectual Property Office on Nov. 3, 2005 andassigned Ser. No. 2005-104906, the contents of which are incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a video telephony apparatusand method for mobile terminals, and in particular, to a video telephonyapparatus and method for protecting a portrait right during a videocall.

2. Description of the Related Art

With the development of electronic and communication industries, usageof mobile terminals is becoming popular and the mobile terminals arebeing more developed to have multi-functional features for satisfyinguser's demands while having reduced size, thickness and weight.

In addition to the basic call function, the mobile terminals provide avariety of additional functions of downloading music files to enjoymusic, downloading Video On Demand (VOD) files to enjoy moving images,and photographing objects to store the object images in album.

Moreover, a variety of peripheral devices attached to the mobileterminals are also being developed. Examples of the peripheral devicesare detachable or built-in digital cameras, TV receivers capable ofreceiving over-the-air broadcasting, and ear microphones attached toprovide a convenient call function. In particular, camera phones cameinto the market in April 2002 and have attracted sensational popularity.Nowadays, 5 mega-pixel high-quality camera phones are on the market.

The camera phones are used to photograph still and moving images, andare expected to be used for video telephony. Hereinafter, terminalscapable of providing a video telephony function are referred to as“video telephony terminals”.

An example of a video telephony system is the International MobileTelecommunications-2000 (IMT-2000) wireless system. The IMT-2000wireless system includes 2.5th generation (2.5G) and 3rd generation (3G)wireless systems such as Evolution Data Only/Evolution Data and Voice(EVDO/EVDV) systems and a Wideband Code Division Multiple Access (WCDMA)systems.

In the video telephony system, a calling terminal and a called terminalexchange moving image streams with each other through a packet-switchednetwork or a circuit-switched network, which is controlled using theH.245 protocol. The H.245 protocol defines control messages formediating performances and channels between video telephony terminals.These control messages are used to perform functions such as capabilityexchange, opening/closing of logical channels, mode request, flowcontrol, and general command.

The H.245 protocol is also use to negotiate compatibility between videotelephony terminals and to control Quality of Service (QoS). The QoScontrol includes frame/bit rate control, image size control, and fastupdate request.

In the video telephony system, when a calling terminal compresses andtransmits a moving image of a calling user to a called terminal, thecalled terminal restores the compressed moving image to an originalmoving image and displays the original moving image on its display unit.Likewise, when the called terminal compresses and transmits a movingimage of a called user to the calling terminal, the calling terminalrestores the compressed moving image to an original moving image anddisplays it on its display unit.

A conventional video telephony system provides a general video telephonyfunction for a calling user to call the other party while viewing animage of the other party directly. In addition to the general videotelephony function, a variety of convenient functions are beingdeveloped to accommodate general users. An example of the convenientfunctions is a camcorder function for a user to record and play movingimages in a non-call state. Another example is a function fortransmitting recorded moving images to the other party through aMultimedia Message Service (MMS).

There is an increasing desire to store an image of the other party inreal time during a video call. What is actually proposed is a functionfor a user to store a facial image of the other party in real timeduring a video call.

In case where a function for storing an image of the other party duringa video call is provided, there is a possibility that a receiving partymay store and reuse or distribute an image of a transmitting partywithout the transmitting party's permission. At the present time, thereare no restrictions on the use of stored image (or multimedia) contents.Therefore, the receiving party can freely use the stored image contentswithout restriction. For example, the receiving party can move thestored image data into his computer or other devices and also can copyand edit the stored image data.

However, the portrait right and use right for the image contents of thetransmitting party belong to the transmitting party that is a contentprovider. Therefore, the receiving party must obtain the permission ofthe transmitting party in order to use the image contents of thetransmitting party.

A similar concept is Digital Right Management (DRM) whereby a userobtains a predetermined right to use multimedia contents by paying amobile communication operator a fee for the user of the multimediacontents. Accordingly, it is difficult to apply the current DRM conceptto a video call service. What is required, therefore, is a scheme forprotecting image contents during a video call.

SUMMARY OF THE INVENTION

An object of the present invention is to substantially solve at leastthe above problems and/or disadvantages and to provide at least theadvantages below. Accordingly, an object of the present invention is toprovide an apparatus and method for protecting a portraits right duringa video call using mobile terminals.

Another object of the present invention is to provide an apparatus andmethod for restricting the rights to capture, store and use multimediacontents of the other party during a video call using mobile terminals.

According to one aspect of the present invention, a video telephonyapparatus for a mobile terminal includes a controller for exchangingprotocol signals for a video call with an other party terminal, anddemultiplexing a moving image and a voice that are received from theother party terminal; a display unit for displaying the received movingimage; a codec for playing the received voice; and a content controllerfor managing Right Objects (ROs) of multimedia contents received fromthe other party terminal, and capturing the displayed moving image andthe played voice according to the ROs.

According to another aspect of the present invention, a video telephonymethod for a mobile terminal includes determining if a multimediacontent capture request message is received from an other party terminalduring a video call; and if the multimedia content capture requestmessage is received, transmitting a response message including ROs ofmultimedia contents to the other party terminal, the ROs of multimediacontents being set by a user of the mobile terminal.

According to a further aspect of the present invention, a videotelephony method for a mobile terminal includes determining if a user ofthe mobile terminal selects to capture multimedia contents from an otherparty terminal during a video call; if the capturing mode is selected,transmitting a multimedia content capture request message to the otherparty terminal; and receiving a response message including ROs ofmultimedia contents from the other party terminal.

According to still another aspect of the present invention, a videotelephony method includes performing a video call between a first mobileterminal and a second mobile terminal; transmitting a multimedia contentcapture request message from the second mobile terminal to the firstmobile terminal during the video call; transmitting a response messageincluding ROs of multimedia contents from the first mobile terminal tothe second mobile terminal, the ROs being preset by a user of the firstmobile terminal; and capturing multimedia contents of the other party atthe second mobile terminal according to he ROs, the other party beingthe user of the first mobile terminal.

According to yet another aspect of the present invention, a videotelephony method includes exchanging protocol signals for a video callbetween a first mobile terminal and a second mobile terminal to set up acall therebetween; exchanging preset Right Objects (ROs) of multimediacontents between the first mobile terminal and the second mobileterminal after the call setup; performing the video call after theexchange of the preset ROs; transmitting a multimedia content capturerequest message from the second mobile terminal to the first mobileterminal during the video call; transmitting a response messageincluding a capture permission/rejection notice from the first mobileterminal to the second mobile terminal; and if the response messageincludes a capture permission notice, capturing multimedia contents ofthe other party at the second mobile terminal according to the exchangedROs, the other party being a user of the first mobile terminal.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features, and advantages of the presentinvention will become more apparent from the following detaileddescription when taken in conjunction with the accompanying drawings inwhich:

FIG. 1 is a block diagram of a typical mobile terminal according to thepresent invention;

FIG. 2 is a flowchart illustrating a procedure for performing a videocall in a first mobile terminal, according to the present invention;

FIG. 3 is a flowchart illustrating a procedure for performing a videocall in a second mobile terminal, according to the present invention;

FIG. 4 is a flow diagram illustrating a signal exchange procedurebetween the first and second mobile terminals, according to the presentinvention; and

FIGS. 5A and 5B are diagrams illustrating screens displayed during thevideo call, according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the present invention will be described hereinbelow with reference to the accompanying drawings. In the followingdescription, well-known functions or constructions are not described indetail because they would obscure the present invention.

The present invention provides a scheme for restricting the rights tocapture, store and use multimedia contents of the other party during avideo call using mobile terninals.

In the following description, Right Objects (ROs) of multimedia contentsare defined as codes for protecting portrait rights and contents. The ROcodes can be broadly classified into the following two categories.

1) A first RO code indicates whether to permit a receiving party (i.e.,the other party) to capture and store a transmitting party's movingimage, still image and voice that are being played in a receivingterminal (i.e., the other party terminal). At this point, the capturingand storing of the transmitting party's moving image, still image andvoice may be permitted totally, partially or selectively.

2) A second RO code indicates whether to permit the receiving party toreproduce, edit and distribute the stored image and voice.

The first RO code and the second RO code may be simultaneously orseparately transmitted to the receiving terminal.

FIG. 1 is a block diagram of a typical mobile terminal with a videotelephony function according to the present invention. Examples of themobile terminal with a video telephony function are Personal DataAssistants (PDAs), International Mobile Telecommunications-2000(IMT-2000) terminals, and 4th-generation (4G) broadband systemterminals. The following description is made in terms of the generalstructure of the above terminals.

Referring to FIG. 1, the mobile terminal includes a controller 100, aprogram memory 102, a data memory 104, a nonvolatile memory 106, akeypad 108, a display unit 110, a coder-decoder (codec) 112, amicrophone 114, a speaker 116, an antenna 118, a radio-frequency (RF)module 120, a modem 122, a camera module 124, and a content controller126.

The controller 100 controls the overall operation of the mobileterminal. According to the present invention, the controller 100 drivesan H.324M protocol stack for a video call. That is, the controller 100connects/disconnects a call, and multiplexes/demultiplexes video andaudio signals that are transmitted/received to/from the other partyterminal.

An H.245 protocol layer transmits/receives control messages formediating performances and channels between mobile terminals. The H.245protocol layer processes control commands for requesting storage ofvideo contents and transmitting a security key of a transmitting party.A detailed description about the general control operation of thecontroller 100 will be omitted for conciseness.

The program memory 102 stores a program for controlling the overalloperation of the mobile terminal. The program memory 102 may be a flashmemory. The data memory 104 temporarily stores data generated during theoperation of the mobile terminal. The data memory 104 may be a randomaccess memory (RAM). The nonvolatile memory 106 stores system parametersand a variety of updatable data such phone numbers, Short MessageService (SMS) messages, and image data. The nonvolatile memory 106 maybe an Electrically Erasable Programmable Read-Only Memory (EEPROM). Thememories 102, 104 and 106 manage the types, titles, sizes, substances,creation dates, codec information, and ROs of stored contents (e.g.,moving images, pictures, MMS messages, SMS messages, E-mails).

The keypad 108 includes numeric keys of digits 0-9 and a plurality offunction keys, such as a Menu key, a Cancel (delete) key, a Confirmationkey, a Talk key, an End key, an Internet connection key, and Navigationkeys (▴/▾/

). The keypad 108 provides the controller 100 with key input datacorresponding to a key pressed by a user. The display unit 110 displaysstatus information (or indicators) generated during the operation of themobile terminal, numerals and characters, moving images and stillimages, and so on. The display unit 110A may be a color Liquid CrystalDisplay (LCD).

The codec 112 connected to the controller 100, and the speaker 116 andthe microphone 114 connected to the codec 112 constitute a voiceinput/output block that is used for voice calls. The codec 112 convertsPulse Code Modulation (PCM) data received from the controller 100 intoanalog voice signals to output the analog voice signals to the speaker116. Also, the codec 112 converts voice signals received from themicrophone 114 into PCM data to provide the PCM data to the controller100.

The RF module 120 down-converts an RF signal received through theantenna 118 to provide the resulting baseband signal to the modem 122.Also, the RF module 120 up-converts a baseband signal provided from themodem 122 to transmit the resulting RF signal through the antenna 118.The modem 122 processes the baseband signals that are exchanged betweenthe RF module 120 and the controller 100. In the case of CDMAcommunication, the modem 122 performs channel coding and spreading ondata to be transmitted and performs despreading and channel decoding onreceived data.

The camera module 124 includes a sensor for photographing an image of atarget object and an image processor for converting analog electricalsignals received from the sensor into digital data and performing imageprocessing on the digital data. The sensor may be a Complementary MetalOxide Semiconductor (CMOS) sensor or a Charge Coupled Device (CCD). Thecamera module 124 photographs an image of a target object through alens, and converts the photographed image data (e.g., YUV data) intodisplay data (e.g., RGB data) to output the display data to the displayunit 110. If the mobile terminal is in a video call mode, the cameramodule 124 outputs the photographed image data not only to the displayunit 110 but also to the controller 100 so as to transmit thephotographed image data to a receiving terminal.

The content controller 126 controls a multimedia content captureprogram, manages security-related encryption keys and RO settings, andcontrols contents according to the RO settings.

The operations of the present invention will now be described in detail.Hereinafter, mobile terminals participating in a video call are referredto as a first mobile terminal and a second mobile terminal. Thefollowing description is made assuming that the second mobile terminaltransmits a multimedia content capture request message to the firstmobile terminal and the first mobile terminal transmits a correspondingcontent RO to the second mobile terminal in response to the multimediacontent capture request message.

FIG. 2 is a flowchart illustrating a procedure for performing a videocall at a first mobile terminal, according to the present invention.

Referring to FIG. 2, when a user presses a video call button of thefirst mobile terminal, the controller 100 of the first mobile terminalexchanges various control data (e.g., codec performance) for a videocall with the second mobile terminal in step 201. In step 203, thecontroller 100 detects and exchanges preset multimedia content ROs(i.e., default ROs) with the second mobile terminal. A mobile terminalmanufacturer, a video call service provider, or a mobile communicationoperator may preset the default ROs.

In step 205, the controller 100 determines if the user changes the ROs.If not, the controller 100 directly proceeds to step 209; and if so, thecontroller 100 sequentially proceeds to step 207 and step 209. In step207, the controller 100 transmits the changed ROs to the second mobileterminal and receives a corresponding confirmation message from thesecond mobile terminal.

In step 209, the controller 100 determines if encryption is used for thevideo call. If not, the controller 100 directly proceeds to step 215;and if so, the controller 100 sequentially proceeds to step 211, step213 and step 215. The use or not of the encryption may be preset at theterminal manufacturing stage or may be set by the user. In step 211, thecontroller 100 creates an encryption key. The content controller 126under the control of the controller 100 may create the encryption key.In step 213, the controller 100 exchanges encryption-related data (e.g.,the created encryption key) with the second mobile terminal, therebycompleting the basic settings for the video call.

In step 215, the controller 100 performs an actual video call byexchanging moving image signals and voice signals with the second mobileterminal as illustrated in FIGS. 5A(a) and 5A(b). FIGS. 5A(a) and 5A(b)illustrate a display screen of the first mobile terminal and a displayscreen of the second mobile terminal, respectively.

In step 217, the controller 100 determines if a multimedia contentcapture request message (Capture_REQ) is received from the second mobileterminal during the video call. If not, the controller 100 returns tostep 215; and if so, the controller proceeds to step 219. In step 219,the controller 110 determines if the user permits the capture request.At this point, the controller 100 displays a message for informing theuser of the capture request on the display unit 110 as illustrated inFIG. 5A(e), and the user permits or rejects the capture request bypressing a “YES” button or a “NO” button.

If the capture request is rejected, the controller 100 returns to step215; and if the capture request is permitted, the controller 100proceeds to step 221. In step 221, the controller 100 displays an ROsetting change screen in a display window as illustrated in FIG. 5B(f).At this point, current ROs (e.g., the number of times of reproduction,usage duration, storage time, right to copy, edit, and distribution) aredisplayed and can be changed by the user.

In step 223, the controller 100 determines if the user changes the ROs.If not, the controller 100 directly proceeds to step 227; and if so, thecontroller 100 sequentially proceeds to step 225 and step 227. In step225, the controller 100 transmits the changed ROs to the second mobileterminal.

In step 227, the controller 100 determines if encryption is used for thecaptured image. If not, the controller 100 directly proceeds to step233; and if so, the controller 100 sequentially proceeds to step 229,step 231 and step 233. In step 229, the controller 100 creates anencryption key. The content controller 126 under the control of thecontroller 100 may create the encryption key. In step 231, thecontroller 100 exchanges encryption-related data (e.g., the createdencryption key) with the second mobile terminal.

In step 233, the controller 100 performs an actual video call byexchanging moving image signals and voice signals (i.e., video and audiosignals) with the second mobile terminal as illustrated in FIGS. 5B(h)and 5B(i). At this point, using the created encryption key, thecontroller 100 encrypts the video and audio signals to be transmitted.

In step 235, the controller 100 receives a capture complete messageincluding capture-related information from the second mobile terminalduring the video call. In step 237, the controller 100 displays thecapture-related information as illustrated in FIG. 5B(j). Thereafter,the controller 100 returns to step 215.

The second mobile terminal's operation corresponding to the procedureillustrated in FIG. 2 will be described below.

FIG. 3 is a flowchart illustrating a procedure for performing a videocall at the second mobile terminal, according to the present invention.Referring to FIG. 3, when a video call is initiated, the controller 100of the second mobile terminal exchanges various control data (e.g.,codec performance) for a video call with the first mobile terminal instep 301. In step 303, the controller 100 detects and exchanges presetmultimedia content ROs (i.e., default ROs) with the first mobileterminal. The default ROs may be preset by a mobile terminalmanufacturer, a video call service provider, or a mobile communicationoperator.

In step 305, the controller 100 determines if an RO change requestmessage is received from the first mobile terminal. If not, thecontroller 100 directly proceeds to step 309; and if so, the controller100 sequentially proceeds to step 307 and step 309. In step 307, thecontroller 100 stores the changed ROs and transmits a confirmationmessage to the first mobile terminal.

In step 309, the controller 100 determines if the first mobile terminaluses encryption. If not, the controller 100 directly proceeds to step313; and if so, the controller 100 sequentially proceeds to step 311 andstep 313. In step 311, the controller 100 receives theencryption-related data (e.g., the encryption key) from the first mobileterminal, thereby completing the basic settings for the video call.

In step 313, the controller 100 performs an actual video call byexchanging moving image signals and voice signals (i.e., video and audiosignals) with the first mobile terminal as illustrated in FIGS. 5A(a)and 5A(b). FIGS. 5A(a) and 5A(b) illustrate the display screen of thefirst mobile terminal and the display screen of the second mobileterminal, respectively.

In step 315, the controller 100 determines if a user of the secondmobile terminal selects a content capture (storage) mode during thevideo call, as illustrated in FIG. 5A(c). If not, the controller 100returns to step 313; and if so, the controller proceeds to step 317. Instep 317, the controller 110 transmits a capture request message to thefirst mobile terminal and displays a standby screen on a display windowas illustrated in FIG. 5A(d).

In step 319, the controller 100 determines if a response message for thecapture request message is received from the first mobile terminal. Ifnot, the controller 100 returns to step 313; and so, the controller 100proceeds to step 321. In step 321, the controller 100 analyzes theresponse message, displays the screen of FIG. 5B(g), and determines ifthe ROs of the first mobile terminal have been changed. If not, thecontroller 100 directly proceeds to step 325; and if so, the controller100 sequentially proceeds to step 323 and step 325. In step 323, thecontroller 100 stores the changed ROs and transmits a correspondingconfirmation message to the first mobile terminal.

In step 325, the controller 100 determines if the first mobile terminaluses encryption for captured moving images. If not, the controller 100directly proceeds to step 329; and if so, the controller 100sequentially proceeds to step 327 and step 329. In step 327, thecontroller 100 receives the encryption-related data (e.g., theencryption key) from the first mobile terminal.

In step 329, the controller 100 performs an actual video call byexchanging moving image signals and voice signals with the first mobileterminal as illustrated in FIGS. 5B(h) and 5B(i). At this point, usingthe received encryption key, the controller 100 recovers original movingimages from the received moving images.

In step 331, the controller 100 captures multimedia contents accordingto the ROs received from the first mobile terminal. In step 333, thecontroller 100 determines if the capturing of multimedia contents iscompleted. If not, the controller 100 returns to step 331; and if so,the controller 100 proceeds to step 335. In step 335, the controller 100transmits a capture complete message including capture-relatedinformation to the first mobile terminal. Thereafter, the controller 100returns to step 313. The captured multimedia contents are managedaccording to the ROs received from the first mobile terminal.

For better understanding of the present invention, a signal exchangeprocedure between the first and second mobile terminals will bedescribed below with reference to the flowchart of FIG. 4.

Referring to FIG. 4, in order to set up a video call, the first andsecond mobile terminals exchange protocol signals for the video call instep 400. At this point, the video call protocol is the H.245 protocol.In step 402, the first and second mobile terminals exchange defaultmultimedia content ROs that were preset by a mobile terminalmanufacturer, a video call service provider, or a mobile communicationoperator. At this point, the first and second mobile terminals detectthe default multimedia content RO of the other party terminal and maydisplay the detected ROs on their display units.

If a user changes the ROs of the first mobile terminal, it transmits thechanged ROs to the second mobile terminal in step 404. Upon receivingthe changed ROs from the first mobile terminal, the second mobileterminal transmits a confirmation message corresponding to the changedROs to the first mobile terminal in step 406.

If encryption is used in the first mobile terminal, the first mobileterminal creates encryption-related data (e.g., an encryption key) andtransmits the encryption-related data to the second mobile terminal instep 408. In step 410, the first and second mobile terminals initiate avideo call to transmit/receive video/audio data that are encrypted.

If a user of the second mobile terminal elects to capture multimediacontents of the other party during the video call, the second mobileterminal transmits a multimedia content capture request messageCapture_REQ to the first mobile terminal in step 412. At this point, thefirst mobile terminal displays an RO setting change screen and a user ofthe first mobile terminal changes the ROs using the RO setting changescreen. In step 414, the first mobile terminal transmits a captureresponse message Capture_RSP including the changed ROs to the secondmobile terminal.

Thereafter, if encryption is used in the first mobile terminal, thefirst mobile terminal creates encryption-related data and transmits theencryption-related data to the second mobile terminal in step 416. Instep 418, the first and second mobile terminals resume the video call byexchanging video/audio data that are encrypted. At this point, thesecond mobile terminal captures and stores currently-played multimediacontents according to the changed ROs.

Upon completion of the capturing of the multimedia contents, the secondmobile terminal transmits a capture complete message to the first mobileterminal in Step 420. Upon receipt of the capture complete message, thefirst mobile terminal displays the ROs of the captured multimediacontents.

In the above embodiment, the ROs exchanged during the video call setupare the default ROs that were preset by one of the mobile terminalmanufacturer, the video call service provider, or the mobilecommunication operator. In another embodiment, the ROs exchanged duringthe video call setup may be ROs that are preset by the user. In thiscase, the mobile terminal attempts to capture multimedia contentsaccording to the ROs that were preset by the user.

As described above, the mobile terminals exchange ROs of the multimediacontents during the video call, thereby making it possible to protectthe portrait rights during the video call. In addition, the mobileterminals exchange the RO data about the number of times ofreproduction, the use duration, the storage time, and the right to copy,edit, and distribute with respect to the captured multimedia contents,thereby making it possible to provide users with a video call servicewith enhanced security.

While the present invention has been shown and described with referenceto certain preferred embodiments thereof, it will be understood by thoseskilled in the art that various changes may be made therein withoutdeparting from the spirit and scope of the present invention as furtherdefined by the appended claims.

What is claimed:
 1. A mobile communication terminal comprising: acontroller for exchanging protocol signals for a video call with another party terminal, and demultiplexing a moving image that arereceived from the other party terminal; a display unit for displayingthe received moving image; a codec for playing the received voice; and acontent controller for managing Right Objects (ROs) of multimediacontents received from the other party terminal, and capturing thedisplayed moving image and the played voice according to the ROs,wherein the ROs include a first RO code indicating whether to permitcapturing of moving images, still images and voice signals, and a secondRO code indicating whether to permit reproducing, editing anddistributing captured multimedia contents.
 2. The mobile communicationterminal of claim 1, wherein the ROs are exchanged at initial call setupand are changeable during a video call.
 3. The mobile communicationterminal of claim 1, wherein the content controller controls amultimedia content capture program, manages security-related encryptionkeys and RO settings, and controls contents according to the ROsettings.
 4. The mobile communication terminal of claim 1, wherein thevideo call protocol is an H.245 protocol.
 5. A video telephony methodfor a mobile terminal, comprising the steps of: determining if amultimedia content capture request message is received from an otherparty terminal during a video call; and if the multimedia contentcapture request message is received, transmitting a response messageincluding Right Objects (ROs) of multimedia contents to the other partyterminal, the ROs of multimedia contents being set by a user of themobile terminal, wherein the ROs include a first RO code indicatingwhether to permit capturing of moving images, still images and voicesignals, and a second RO code indicating whether to permit reproducing,editing and distributing captured multimedia contents.
 6. The videotelephony method of claim 5, further comprising displaying a screen forchanging the ROs of multimedia contents, if the multimedia contentcapture request message is received.
 7. The video telephony method ofclaim 5, further comprising: receiving a capture complete messageincluding capture-related information from the other party terminal; anddisplaying the capture-related information.
 8. The video telephonymethod of claim 5, further comprising exchanging currently-set ROs ofmultimedia contents with the other party terminal during call setup. 9.The video telephony method of claim 8, wherein the exchanged ROs aredefault data that are preset by one of a mobile terminal manufacturer, avideo call service provider, and a mobile communication operator. 10.The video telephony method of claim 8, wherein the exchanged ROs aredata that are preset by the user.
 11. A video telephony method for amobile terminal, comprising the steps of: determining if a user of themobile terminal selects to capture multimedia contents from anotherparty terminal during a video call; if the capturing mode is selected,transmitting a multimedia content capture request message to the otherparty terminal; and receiving a response message including Right Objects(ROs) of multimedia contents from the other party terminal, wherein theROs include a first RO code indicating whether to permit capturing ofmoving images, still images and voice signals, and a second RO codeindicating whether to permit reproducing, editing and distributing ofcaptured multimedia contents.
 12. The video telephony method of claim11, further comprising: capturing currently-displayed multimediacontents according to the ROs included in the response message; andafter completion of the capturing step, transmitting a capture completemessage including capture-related information to the other partyterminal.
 13. A video telephony method comprising the steps of:performing a video call between a first mobile terminal and a secondmobile terminal; transmitting a multimedia content capture requestmessage from the second mobile terminal to the first mobile terminalduring the video call; transmitting a response message including RightObjects (ROs) of multimedia contents from the first mobile terminal tothe second mobile terminal, the ROs being preset by a user of the firstmobile terminal; and capturing multimedia contents of the other party atthe second mobile terminal according to the ROs, the other party beingthe user of the first mobile terminal, wherein the ROs include a firstRO code indicating whether to permit capturing of moving images, stillimages and voice signals, and a second RO code indicating whether topermit reproducing, editing and distributing captured multimediacontents.
 14. The video telephony method of claim 13, furthercomprising: transmitting a capture complete message includingcapture-related information from the second mobile terminal to the firstmobile terminal after completion of the capturing step; and displayingthe capture-related information on a display unit of the first mobileterminal.
 15. A video telephony method comprising the steps of:exchanging protocol signals for a video call between a first mobileterminal and a second mobile terminal to set up a call therebetween;exchanging preset Right Objects (ROs) of multimedia contents between thefirst mobile terminal and the second mobile terminal after the callsetup; performing the video call after the exchange of the preset ROs;transmitting a multimedia content capture request message from thesecond mobile terminal to the first mobile terminal during the videocall; transmitting a response message including a capturepermission/rejection notice from the first mobile terminal to the secondmobile terminal; and if the response message includes a capturepermission notice, capturing multimedia contents of the other party atthe second mobile terminal according to the exchanged ROs, the otherparty being a user of the first mobile terminal, wherein the ROs includea first RO code indicating whether to permit capturing of moving images,still images and voice signals, and a second RO code indicating whetherto permit reproducing, editing and distributing of captured multimediacontents.
 16. The video telephony method of claim 15, furthercomprising: transmitting a capture complete message includingcapture-related information from the second mobile terminal to the firstmobile terminal after completion of the capturing step; and displayingthe capture-related information on a display unit of the first mobileterminal.
 17. A mobile communication terminal comprising: a controllerfor exchanging protocol signals for a video call with an other partyterminal, and demultiplexing a moving image that are received from theother party terminal; a display unit for displaying the received movingimage; and a content controller for managing Right Objects (ROs) ofmultimedia contents received from the other party terminal, andcapturing the displayed moving image according to the ROs, wherein theROs include a first RO code indicating whether to permit capturing ofmoving images, still images and voice signals, and a second RO codeindicating whether to permit reproducing, editing and distributingcaptured multimedia contents.